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Fast direction wavelet transforming method for image compression

An image compression and wavelet transform technology, applied in the field of image processing, can solve problems such as edge or texture distortion, inability to effectively concentrate pixel energy, etc., to achieve the effect of improving quality

Inactive Publication Date: 2011-03-30
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Therefore, the wavelet transform in the JPEG2000 standard cannot effectively concentrate the energy of pixels in these edges or textures
These edges or textures in the reconstructed image are severely distorted when the compression factor increases

Method used

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  • Fast direction wavelet transforming method for image compression
  • Fast direction wavelet transforming method for image compression
  • Fast direction wavelet transforming method for image compression

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0031] In the prior art, the direction of the pixels in the edge or texture in the image is not any one of 0 degree, 90 degree or ±45 degree, and the corresponding wavelet coefficients are scattered in the HL, LH and HH subbands. Therefore, the wavelet transform in the JPEG2000 standard cannot effectively concentrate the energy in these edges or textures.

[0032] In order to solve the above problems, the embodiment of the present invention first disc...

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Abstract

The embodiment of the invention discloses a fast direction wavelet transforming method for image compression. The method comprises the following steps of: setting directions of an edge or a texture in the image; parting and dividing the image into sub blocks; determining the direction of the pixel of the edge or the texture corresponding to each sub block; executing wavelet lifting transformationalong the edge or the texture direction according to the direction of the pixel point in the image so as to centralize the energy of wavelet coefficients on the edge or the texture into a few coefficients having rather large absolute values and obviously decrease the absolute value of the wavelet-transforming high frequency coefficient. The quantized larger coefficient is easy to be reserved so as to obtain the reconstructed image with clearer edge or texture.

Description

technical field [0001] The invention relates to the field of image processing, more specifically, relates to a fast directional wavelet transform method for image compression. Background technique [0002] The application of digital images is very common. Therefore, standards for how digital images can be efficiently displayed and stored are critical. Today, the most successful and in-use still image compression standard is that of the Joint Photographic Experts Group (JPEG). [0003] As the latest generation of still image compression standard, JPEG2000 can restore higher quality images while pursuing high compression ratio. [0004] In the JPEG2000 compression standard, the two-dimensional wavelet transform is performed on the image, and then the wavelet coefficients are encoded. Compared with the original image, the energy distribution of wavelet coefficients is more concentrated, which is beneficial to image compression. [0005] In the JPEG2000 standard, the two-dim...

Claims

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Application Information

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IPC IPC(8): G06T9/00H04N7/26H04N19/635H04N19/64
Inventor 陈波成礼智王红霞
Owner NAT UNIV OF DEFENSE TECH
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